-
He said that the percent ionic character, and this is within a bond, not for a compound, for a covalent bond.
他提到离子百分数，是指一根键中，并非一个分子中。
-
So let's figure out the bond order for our two molecules here that we figured out the electron configuration for.
让我们看看这里,两个分子的键序是多少。
-
OK, then it says draw a single bond from each surrounding atom to the central atom, and subtract two valence electrons.
后将中心原子与其相邻原子之间,连上单键，然后减掉2个价电子。
-
Now when Black Boy was published there was a war bond advertisement on the back cover of the book.
当《黑孩子》出版时,战争债券的广告是附在书后的。
-
I mean, hypothetically a bond trading at $.60 on the dollar with an 8% coupon, five-year bond that's yielding about 18%.
我的意思是，假设一种债券以0。60美元进行交易,同时有8%的票息，五年期债券收益率在18%左右。
-
So, there's actually another way to graph it where we can directly graph the dissociation energy or the bond strengths.
其实，还有另外一种画这个曲线的方式,可以直接画出离解能的大小,或者键的强度。
-
So what we can actually directly compare is the dissociation energy or the bond strength of nitrogen versus hydrogen.
因此实际上我们可以直接进行比较,对氮分子与氢分子的离解能,或键的强度。
-
And you would find that the bond energy of the heteronuclear molecule was nowhere on the average of the two.
你将发现,电子相同的分子的总能量,并不是平分的。
-
Well, if this bond has completely identically equal sharing of electrons, then this bond will be nonpolar.
如果一根键连的两个原子,对键上的电子吸引程度是完全等价的，那么这根键是非极性的。
-
So, if we take a look at what a single bond is, and let me grab some molecules here.
如果来我们看一下单键，让我拿个分子。
-
So, we know from our calculation that we can do over here, that this bond is polar.
我们通过计算都知道,这个键是非极性的。
-
And you can go ahead and tell me what you think the bond order is going to be for this molecule.
你们告诉我你觉得,这个分子的键序应该是怎样的。
-
so you can see that there is going to be two sets in antibonding, three sets in bonding for a net of one, giving us the single bond.
因此你能看到,反键轨道上有两组，三组成键，得到一组净成键，所以成的是单键。
-
What these do is they insure the bond-- they insure the investor against the municipality failing to pay on the bond.
他们的业务是为市政债券保险,他们确保政府当局,有能力向投资者进行赔付
-
And so both of these lobes together constitute a pi bond.
上下两片叶一起组成了一根π键。
-
So there's not a lot of room in the government bond market or other high-quality bond markets to generate excess returns.
所以对于政府债券或者优质债券,超额收益的空间不大
应用推荐